Nav_scho appoint nominal strum. The Great Encyclopedia of Oil and Gas

Growing needs of people to make it easy to establish, that the servants are doing it, like at work, and at the picking. The largest part of the building is powered by electricity, and failures in the measure can lead to breakage, trivial investigations of the reasons for that component, resulting in unscrupulousness. Therefore, be it an accident in an electrical installation with skin rock, everything is dear to the rescuer. Exit one - necessary zahisny pristry, so as to solve all problems and be inspired by superiority, accessibility and economy.

Vsіm tsim parameters v_dpov_daє automatic vimikach (automatic). Tse switching device, the mechanics of some kind of building conduct that jet switching at a splendid electric power station. Crimea, at emergency situations the automatic switch turns on the slowdown after the song hour or after the increase in the struma to the recognized value (strum of a short zamikannya). Automation buli rozroblenі for zakhistu electrical installations vіd revantazhen, strumіv short chimes, And deyakі models і vіd vіd nizzhenої napruzha. They can also be used to turn on and turn on the supply of life pressure with the method of operational management.

Structurally, the simplest modern automatic switch includes a dielectric case, an important one, two contacts (collapsible and stationary) and a switch (magnetic and thermal). The magnetic or mittievy rozchіpluvach vykavany at the sight of the solenoid, angry with a kind of roz'dnuє lansyug when the designated value of the struma is overwhelmed, being drawn into the winding. For quick reference (a fraction of a second) you need a strum that exceeds the nominal value by 2-10 times. A thermal expansion spratsovuє with a larger three-fold influx of a raised strum (from a few seconds to a year), and a strum with which it is guilty of the growth of everything in the second time. The increase against the nominal strum increases the temperature of the bi-metal plate, as it changes its length and, by the same token, cuts the lance. After reaching the automatic vimikach, I will be ready again until you are educated.

Automatic vimics follow the following parameters:
- seemingly struma (steady, changeable or offensive). The magnitude of the struma can swell at the boundaries: vіd 6.3A to 6.3 kA;
- for a number of poles: from one to four poles;
- for stream exchange (in the presence of chi ni);
- for types of expansions (maximum, independent rank zero);
- for the time interval: without a vitrimka, from a zatrimkoy independent view of the size of the struma, from a reversely fallow view of the struma with a decrease in their characteristics;
- For the obviousness of switching of secondary languages ​​(є chi ні);
- for the type of connection of lancers (from the rear, from the front, from the universal);
- according to the type of drive (manual, spring, with electromagnetic motor or pneumatic);
- behind the stage of sealing the body for protection against the inflow of dovkillya.

Krim tsgogo, automatically divide by hour spratsovuvannya (in the form of giving a command to open up to the actual opening of the lansyug):
- Normal. The hour varies from 0.02 to 0.1 seconds;
- selective. The hour interval can be adjusted at the interval of 1 second;
- Swedish code. Crim for a short period of switching on (0.005 seconds), which automatically causes a streak-blending effect.

Standard range of nominal vimicac streams, Amp: 1, 2, 3, 4, 5, 6, 8, 10, 13, 16, 20, 25, 32, 35, 40, 50, 63, 80, 100, 125, 160, 250, 400, 630, 1000, 1600, 2500, 4000, 6300

When choosing an automatic vimikacha, a crime of a nominal strum, take the following characteristic to the respect (strum of a mitt's split).
For a little vinnyatka, there are three main types of characteristics: B, C, D:
B: strum of mitt splitting in 3*I n to 5*I n inclusive (de I n - nominal strum)
C: vіd 5 * I n to 10 * I n
D: vіd 10 * I n to 50 * I n

On the little one below, a graph of fallow time is shown for the time of spratsovuvannya in the stream, including that їх viability to characteristics B, C or D.

The skin of a person knows in a flash that it is an automatic switch, we will install it in the electrical panel. The largest population on the genetic level knows, if the light is gone near the apartment, lower the drink and turn it over, if the machine at the surface shield is not turned on, and if necessary, turn it on. However, not all can be stated about the technical characteristics of these attachments, and according to some criteria, it is necessary to select them for the conservation of high operational capacities of a robotic underfloor shield.

I visit all my friends on the Electrician at home website. Today, it’s more important, as if on me, the topic, as if without intermediary, I’m pouring into normal work automatic extensions zahistu, and herself - . Not everyone knows what the symbols and signs on the body of the machine mean, so we can decipher the marking and reportly understand what the skin is written on the body of the automatic machine.

Marking of electric automatic machines - identification on the case

All automatic vibrations may have the same technical characteristics. To recognize them, when choosing a machine, markings are applied to the case, which includes a set of schemes, letters, numbers and other symbols. Friends wait, what old look you can’t say anything about the machine itself and all its characteristics can be recognized only for marking.

Marking is applied to the front (front) side of the body of the machine with a permanent farboy, which is not erased, why you can find out about the parameters if the machine is in a robot, then rose under the shield on the din-rail and to the new connection of the darts (it is not necessary to put the darts and pull the shield to read the marking).

On the little one below, you can use a sprat of butts, how to apply marking electrical automation different factories of virobniks. On the skin of them, the marking is clearly visible, vikonan with different letters and numbers. In this article, we will not analyze the trades and add on to the defense, but we will only stick to the zvichayny butov_ modular automation. Ale, in whatever mood of the article, it will be no less a cіkava for beginners, and for professionals, “bison”, as they constantly stick to cym, so it will be a cіkavo to guess the basics of their professions.

Decryption of marking machine

In order to correctly select the automatic machine for purchase, then pay attention not only to the old look and I will add the brand, but also to its characteristics. Let's sort it out in order, what characteristics are displayed by the vibrator on the body of the automatic vimikach the right choice. Automatic marking present such information to yourself until you know it.

1. Firm virobnik (brand) of automatic vimicach

Markuvannya automatic vimics Start with the logo and name the picker. The pictures show automatic machines of the most popular brands hager, IEK, ABB, Schneider Electric.

For a long time now, brandy has been presented to the world public for its foundation, and has proven itself to be a release of yoghurt products. On the case, the name of the virobnik plant is applied at the very top and it is important not to mention it.

2. Linear series of automatic machines (model)

The model of the automatic vimikacha chimes in the form of a series of attachments in the line of the virobnik plant and є alphanumeric characterization, for example, the SH200 and S200 series automatic machines belong to the ABB picker, and Schneider Electric works with Acti9, Nulti9, Brownie.

The butt, as indicated by the marking of automatic indicators by Schneider Electric, hager and IEK.

Most often, the series is assigned to the machine for the recognition of models according to technical characteristics or in the price category, for example, SH200 is protected on a short circuit up to 4.5 kA, less expensive and cheaper for a variant, lower S200, protected by 6 kA.

3. Hour-strum characteristic of the machine

This characteristic is indicated by a Latin letter. There are 5 types of hour-stream characteristics: "B", "C", "D", "K", "Z". Ale widest and first three: "B", "Z" and "D".

Automatically with characteristics of the type "K" and "Z" vikoristovuyut for zakhistu spozhivachіv, deztosovuєtsya actively inductive interference and electronics obviously.

Nayuniversalnisha, how to go for stosuvannya in the butt. characteristic type "C". Larger electricians for the installation of electrical wiring for vikoristovu itself її. Vuzkoprofilni z vtkh "B" or "D" can only be used in specialized stores and often at home.

Friends on the topic of the hour of streaming parameters of automatic machines, I have a good article, be kind, come in, read, learn.

4. Nominal strum of the machine

After the letter value, there is a number that indicates the nominal value of the automatic vimikacha. The nominal value indicates the maximum value of the struma, which can be passed without the use of an automatic switch. Moreover, the value of the nominal stream is specified for the sing temperature dovkilla+ 30 degrees.

For example, like rated strum to the machine 16A, then the machine will be trimmed and will not turn on at a temperature of the above medium not higher than +30 degrees. If the temperature is higher than +30, then the machine can work with a surge of less than 16 A.

If the excess is blamed for the measure, then the situation is, if the surge of the bias exceeds the nominal stream on the reaction thermal splitter automatic vimikach. Zalezhno in the multiplicity of the shifting of an hour, for which automatic machine it will turn, we can add up to a few seconds. Strum, in case of any thermal expansion, is guilty of changing the face value of the machine by 13% - 55%.

When blamed for a short flicker, the superficial is blamed, for some kind of reaction electromagnetic rozchipluvach automatic vimikach. The help machine with a short flicker is to blame for a delay of 0.01 - 0.02 seconds, otherwise the melting of the insulation of the electrical wiring with the risk of a distant borrowing will begin.

5. Rated voltage

Vіdrazu pіd marking on automatic hour-strum characteristics where is the value of the nominal voltage, on the basis of the insurance of this machine. The nominal voltage indicator is displayed in Volts (V / V) and can be constant (“-”) or changeable (“~”).

The value of the rated voltage is determined by what kind of wire is transferred to the attachment. Voltage marking transfer two values ​​for single-phase and three-phase merezh. For example, marking 230/400V~ means that the voltage is 230 Volts single-phase mesh, 400 volts three-phase mesh. The "~" sign means changing voltage merezhі.

6. Boundary strum included

The advancing parameter boundary strum is turned on or else called construction of the machine, what do you see. This parameter characterizes the strum of a short chime, which can let the automaton pass through itself and connect without losing its practicality (without the risk of getting out of tune).

The electric tether is a foldable system, which is often blamed on the superstreams after a short flicker. The nadstrums are short, but are characterized by great size. Leather automatic vimikach may limit the commutation building, which indicates the possibility of vitrimatization of the jet and help with it.

For modular automations, the limit value of the strum is set to 4500, 6000 or 10000. The values ​​are specified in Amperes.

7. Class blasting

According to the meanings of the boundary strum, the inclusion on the corps is indicated as such ranks jet exchange class. The blame for the superfluous jets is unsafe, because when they appear, thermal energy is seen. As a result of which the insulation of the electrical wiring begins to melt.

The automatic fader fades out when the short fade strum reaches its maximum value. And in order for the strum short circuit to reach its maximum, one hour will be needed and the more it will be, the more there will be more tasks to install and insulate the electrical wiring.

The strumoobzhuvach sprays the accelerated switch-on of the automatic vimikacha zim without letting the short circuit jet reach its maximum value. In fact, this parameter is between the hour of the short flicker.

There are three classes of strum coater, as if they mark at the black square. Chim is the highest class, Tim is the quickest to turn on the machine.

1. - class - 1st marking day, or in other words, automatic, on the case of some of the highest class of strumming, can be seen up to the first class. Set the hour of defrost to over 10 ms;
2. - class - 2 intermediate hours of passage of the strum SC no more than 6-10 ms;
3. - class - 3 intermediate hours of passage of the strum SC no more than 2.5-6 ms (best seen).

8. Connection diagram and terminal identification

Deyakі robniki put on the case the circuit of connection of the automatic machine of the informing of the rescuer. Wiring diagram electric lanceug with the signs of thermal and electromagnetic expansion. Contacts are also marked on the diagram, which indicate the place of connection of wires.

On single pole machines contacts are marked yak "1" - upper and "2" - lower. Up to the top contact, as a rule, a wire is connected, and up to the bottom contact, a wire is connected. Before the speech, on this topic, there is an okrema of the article, how to correctly connect the machine. On two-pole automata, contacts are marked "1", "3" - top; "2", "4" - lower.

And so it looks like the designation of the circuit and contacts for connecting to a bipolar automatic switch

Also, on two- and four-pole automata, having a connection scheme, you can understand the meaning of the Latin letter “N”, which indicates a terminal for connecting a zero conductor. This is important, because not at all the poles of the multi-pole automatic machines there are rozchіpluvachі (thermal and electromagnetic).

9. Article

On either side of the body of the vending machine, information about the product (article, QR code) is also applied, provided by the brewery, which helps to know the specific model in the catalog of stores.

Having become familiar with the most important information, you will not become a problem, and you can easily choose attachments for such characteristics as you like.

As if this article was a cic for you, I will be vdyachny, so you share it in social measures. If you have blamed for food, or if you don’t mind putting them in the comments, I’ll tell everyone.

Side 1

Nominal trivaliy strum - the largest strum ( chinne meaning), which building device is carried out for a long time at a given rated voltage, the rated frequency and the rated temperature again, at which the temperature of the parts of the device is not guilty of exceeding the permissible one, is set for three-dimensional operation.

Nominal trivaliy strum/zapobіzhnik (cartridge) - strum.

Nominal trivaliy vimikacha strum / Pom is guilty but more than the nominal strum of the installation / nom.

The nominal trip of the strum of sectional reactors is due to the greatest pressure, which is transmitted from section to section at the time of disruption of the normal operating mode. It should be laid down in view of the pressure of generators, transformers, the loading of sections, as well as in the connection scheme of sectional reactors to selected tires and supports.

Nominal trivalium of the strum of electric devices is installed by virobnik plants on the basis of rozrahunkiv and typical tests. This strum is indicated by the passport nominal data of the devices.

In apparatuses with a large rated trival strum, the contact system has main contacts, which are used for carrying out a working strum, and arc extinguishing contacts, which are used for opening an arc. It should be noted that during the opening of the arc on the contacts that are opening, after the transitional processes, overvoltages are caused, which are unsafe for the isolation of the property.

Schemes of twin reactors.

The selection of the main parameters (nominal strum and water opir) of the reactor and the technical and economic priming of the planting are carried out when the optimal variant of the electric power supply scheme is folded.

The topic of automatic devices did not fill the readers with bait, and the main part of the power supply was devoted to how to correctly denominate automatic switches at the stage of designing and connecting a power shield. How do you pour into such a rozrahunok the electrical wiring near the apartment is like a booth. Tsim nutrition and dedicate to this article.

Basic understanding of nominal streams and characteristics of automatic vimics

For the cob we will set up a schedule, on which the hour of turning on the automatic machine is shown to be fallow in the spivv_dnoshennia of the strum at the system and temperatures. Tse is so called.

The shaded zone is the area, in which life the electro-magnetic blasting jet is turned on. The fallow time from the streams is approximately straight-cut, so we can talk about a weak turn-off through other factors. It can be seen at once that in this zone it is easy for the machine to accept the decision to turn on the living quarters.

Insurance for a pardon is a thermal rozchipluvach. Vіn, having overheated, to break the line, to wind it up nominal strum of automatic vimicach without exceeding the critical values. The very existence of such a relocation and to bring it up to the point that the inclusion of living is not required. In order not to insert the mine of the uplifted diy into the shield with your own hands, and it is necessary to understand how to correctly open denominations of automatic vimics, and what is necessary to lie, to inspire you like a rozrahunka.

For example, temperature intervals. If you look at this table, you can clearly see how it changes when the temperature changes.

Remember that when the temperature rises, the automatic will automatically go down, so that the strength of the struma will decrease, if life is turned on. When cold, the fallow is less linear, ale is approximately similar. Tobto nominal for negative temperatures Vishche .

The temperature scale needs to be adjusted in order to understand how to choose an automatic machine for a street shield in a private booth. Otherwise, you need to bring in an electric kettle to set fire to the houses.

Look out, but there is nothing special here. Tse those that are seen in electrical engineering as a manifestation of superconductivity. A number of conductors, when cooled to low temperatures, become superconductors, using opir. In pobutovyh minds, it’s commendable when chilled electromagnetic blower down to temperatures below 25 degrees. It's not so scary, it's just that you need to remember.

These three parameters are the very same zakhist, which allows you to be sung by the one-time inclusion of the problematic litter of the lancer. How to say in simple words, then the machine is respectfully stalked for the strength of the struma in the lance, which is protected, porivnyuyuchi force struma, tension, increase the spozhivannya and wind up the spare strumіv coil, like tse.

In a situation, if the strum begins to grow, the machine is on guard, and it’s more important to sue sinusoids, what is coming. At the same time, the electromagnetic rozchipluvach is also brought to the camp of advanced readiness. Even though the situation has not changed, life is turning on. The whole schedule is higher - the hour of the vimikach's spratsovuvannya. Zatrimka is needed not for the fact that modern materials do not allow to secure the mittve of the fire, but in order to start the jet butt fittings they didn’t bring life until the end.

Star another one nominal vimical capacity of automatic vimics unikati hibnih vimknen - zdatnіst vіdokremiti vіmknennya priladu vіd problems in merezhі. The hour of switching on, as a characteristic, which allows the machine not to burn out, with a short-hour change in the parameters of the stream, which will change the nominal ones.

Now let's look at the attachment of the automatic vimicach:

On this little thing you can clearly see what to wind with a thermal and electromagnetic rozchіplyuvach, impossibility of manual switching on, when the machine is overheated, the fusible conductor will melt. So, when the automatic machine is out of tune and with your own hands, you won’t be happy anymore, but you’ll be vikonan. Irrespective of those that the availability of insurance is not included in the parameters, ce tezh nominal value including automatic vimikacha- the hour of the standby conductor. All the parameters and ratings of the automatic indicators, if it is necessary to check, first choose and install the machine at your shield.

How to correctly open and select the required automatic vimikach

The most correct vimic, tse. It’s a pity, it’s impossible to stand for a shield for an entire hour, so we’ll set it automatically. In order to properly formulate the zahist, we need, vrakhovuchi denominations of automatic vimics, rozrahuvat navantazhennya on the plots of the borders of our apartment, not forgetting about.

UVAGA! The lower ones are correct, but with the necessary reserve of minerality! In order to make a decision, how to choose the correct automaton, use this scheme to determine the maximum value, and not the minimum! Retail price is not to exceed 15%!

What are my faults to take to respect:

• Peretin wires, yaki є important parameter for rozrahunka;
• Tension and launching streams in the distance;
• Nominal strum of automatic vimikaciv at vіdpovіdnostі to nomіnal strum of accessories at danіy dіlyantsі merezha;
• Possibility of one-hour inclusion of the main calming struma;
• Number of lines in the shield;
• Availability at the merezhі ELV (difavtomat);
• The number of phases at the merezhі apartments (booths).

Yakshcho z tsim rozіbralis, the hour has come to proceed to the rozrahunka. First crock, roaring strum_v short zamikannya. Here is the strum, the price of the voltage according to the extension to the support of the fence with the improvement of the flow characteristics.

• U- voltage of the wire (220/380 V);
• R- a new opir measure, re-insurance like a dozhina of electrical wiring, a re-thread and a corrected cost factor.
• k- Correction factor for automatic indicators.

Correction factor k you can take this meaning:

• For automatic "AT": k = 5;
• For automatic "C": k=10,
• For automatic "D": k = 50.

Let's guess that automatic marking will help to fix the value of K, and ours and about those that will help to figure out R. For a clear assessment, approximate values ​​are sufficient.

It’s important to give us an assessment of the beast, that’s the meaning, if the machine doesn’t exactly turn on, to turn it on, turn it on manually. Otriman's figure is important in order not to install an automatic machine with a strum 45A into the shield, for example, 32 will be a boundary. The machine simply does not turn on if all the wiring is already melted.

Now, the nominal strum of automatic vimikaciv as a spivvіdnennia strum force to the total tension of the spondylators with the adjustment of the corrective coefficient of the proportional spodzhivannja tsієї natuzhnostі:

For an apartment, in a yakіy R one 3.4 kW (standard supply) per line, automatic matime 4.55 * 3.4 = 15.47 (16) A .

Tsei rozrahunok miraculously illustrated GOST R 50345-2010, which also regulates the temperature of the mind of operation, for the verification of changes in other ratings of automatic vibrations and changes (peak fluctuations) of the input voltage.

To get into the rozrahunka, take the category of the machine to the point of respect for an hour, that very nominal time frame of the automatic vimikacha, which you can use, is possible, take it from the reserve, choosing more expensive, but more swedish, and we take a clear set of parameters:

• The strength of the struma of the troch is more than 16A (but less than 25, 35 thin.);
• The voltage is more than 250, less than 205 less;
• The span of wires is not more than 2.5 (or other value), with a length of electrical wiring of 110 meters (the value is set as a butt).

To get rid of the presence at the contour of the protection of the ELV, to turn off the strum of the people and prevent the turns, which will be behind the line, but to protect the ELV itself, to transfer the possibility of manual attack to all the measures, you can proceed to the design of the power shield.

What parameters forgot to guess?

Before deciding on the ratings of the automatic vimikachiv, it is easy to sort out the vіdnesemo zahisne vykonannya, the installation methods and the possibility of zovnіshny zastosuvannya.

We already talked about temperature regimes, to give respect to those who mark the MAXIMUM allowable minimum temperature value. Hourly interval of vikoristannya for tsієї temperature no more than 48 years.

The automatic vimikacha can be used in different modes of operation, including in applications with high water content or in high-viscosity viconan. Marking that stage of protection of electrical appliances we also saw in our articles.

The standard for installation today is fastening on a DIN rail, either for an additional brace, or for an additional bolt, which blocks. Some of the automatic machines are supplied with a combined mounting scheme, which allows them to be tapped at the shield, where the din-rail is fixed.

Finish off rare view, attach, in which manual adjustment is allowed nominal value. Taki automatic vimikachi vikoristovuyut at the fences with unstable eating, timchasovyh camps and polovy minds. For pobutovyh minds, especially small ones settlements Qi outbuildings can be not exotic, but necessary.

The final touch will be the standardization of your shield. As a result, the parameters of 10 automatic machines were taken care of - to choose one picker. Choose another vimikach, it’s less than necessary in the future. The power shield is not the right place, 10 automatic machines of ten pickers will get along well.

Automatic vimikach (AB), being an attachment to the strumming of various electric strums in the lance, may have characteristics that describe the parameters of the strumming strum. Such characteristics are the jet that flows through the automatic switch, and the jet itself of the boundary switching capacity of the machine, the nominal jet of the automatic switch, which, at the same time, the jet of the electromagnetic switch of the automatic jet thermal splitter AB. Description strum_v automatic vimikativ it is indicated on the front panel of the accessory and the obov'yazkovy part of the marking of the electric machine.

Nominal strum of automatic vimikacha

Rated strum is indicated on the front, accessible and well-remembered during operation, part of the machine. The designation of the nominal strum of an automatic vimikacha is carried out by a number, sounding the next after the Latin letter, which indicates the hour of the strum characteristic of the machine. The number that means the nominal strum of the automatic vimikacha means that the assignment machine for the installation of electrical wiring, the working strum, which is larger or more advanced than the nominal strum of the automatic vimikacha.

Strum of thermal expansion of automatic vimikacha

Nominal strum of the machine is a parameter that defines the strum of the automatic heater's thermal expansion. Until quiet pіr, while the strum, which flows into the wire and through the machine, which protects less, lower nominal value of the machine, nothing comes up, however, when the value of the strum is overwhelmed, which flows over the value of the nominal stream of the machine, the machine turns on. Shvidkіst spratsovuvannya automatic vimikacha, that hour, through some kind of automaton open power contact, open the lance and turn on the power, lie down in the hour of overrunning the overwhelmed stream and the characteristic curve of the automatic vimikacha. For example, for the C16 machine, the rated strum of some kind is 16A, and the characteristic curve is in accordance with graph C, the machine is turned on when the strum is in the conductor equal to 32 amperes, it will be in the period of the hour from 18 seconds to 150 seconds, and three times the transfer, then the nominal 48 Amp., the automatic vimikach turns on in the range from 4 to 50 seconds, and ten times the nominal stream for the automatic vimikach C16 will turn on for less than 10 seconds. For the skin value of the strum, you can open the hour of switching on the thermal opening of the vicorist graph of the hour-strum characteristic of the examined machine.

Strum of an electromagnetic splitting machine

The strum, which flows through the electromagnet rozchіpuvach of the automatic vimikach, to cause the machine to turn off when the swidkoy i digit is shifted over the nominal strum of the automatic vimikacha, which sounds when wired, it is protected. A short zamikannya vіdpovidaє already swidko growing high strum, scho and vrahovuє pristriy elektromagnіtnogo razchіplyuvаch, scho allows practically mittvo vplyvayut on the mechanism of opening of automatic vimikach with svіdkoi zroschіva strumu, scholeno snorting. The speed of the operation of the electro-magnetic opening does not exceed 0.05 seconds.

Boundary strum of automatic vimicach

The boundary strum of an automatic wimikach is the maximum electric strum, which can be switched off by an automatic switch. The boundary strum of an automatic vimikacha is called PKS and is indicated in the marking on the front surface. The marking of the boundary struma of an automatic vimikacha can be indicated in amperes, meaning 3000, 4500, 6000 or 10000, with which the figure of the boundary struma of an automatic vimikacha is indicated in a straight line, without specifying the size.
In connection with the difference between the number of hours, the number of the straight line is sometimes taken incorrectly and interpreted as an example: the number of turns on and the automatic machine’s turn off are acceptable, the number of calls is guaranteed and other wrong options.
The boundary strum of an automatic humming means that such an automaton is stuck in a fallow zone in the form of the most possible short strumming strum, which can be called into. For a large number of butt-type electrical installations, PKS 4500 Ampere is sufficient, on-butovyh electrical circuit do not allow short flickering strum and change the value of 3000 - 4000 amperes, prote in such short flickerings, through the automatic switch you can skip the strum, which will exceed 4500 amperes. At the time of the 4.5kA automatic machine, with such an overdriven stream, the automatic vimikach cannot turn on the life, so the contact group for the high stream flooring will overheat and burn - burn. The mechanical forces stored in the splitting mechanism should not be pulled out in order to break the contacts that were welded, one type of one and the machine does not vimkne life, boosting the short-circuit current, which will lead, in the shortest drop until melting and wiring, and in the top - after.